Abstract
The design, configuration and operation of the soil-source heat pump system in four actual projects are monitored, collected and investigated. Combined with various test parameters of the project, the energy efficiency of the ground source heat pump system was compared and measured, and detailed data analysis was conducted from the aspects of heat exchange of ground source heat pump system, heat efficiency coefficient of ground source heat pump system, performance of ground source heat pump unit and performance of soil source heat pump system. It provides a basis for the formulation of operation strategy of soil-source heat pump system in the future, so as to serve the sustainable development of energy saving technology of shallow soil-source heat pump system.
Highlights
In the past 30 years, ground source heat pump system as a representative of renewable energy technology has been concerned by the industry
For the pipelines with multiple buried pipes, the comprehensive heat exchange energy efficiency coefficient EZ is used for evaluation, which is defined as the ratio between the average value of actual heat exchange Q of the buried pipes and the theoretical maximum heat exchange Q', which is a dimensionless quantity, namely: EZ
If there are no specific provisions in the design document, the refrigerating energy efficiency ratio of the system shall be ≥ (EERsys) 3.0 and the heating performance coefficient of the system shall be ≥(COPsys)
Summary
In the past 30 years, ground source heat pump system as a representative of renewable energy technology has been concerned by the industry. Compared with conventional air-conditioning systems, the ground source heat pump air-conditioning system is superior in energy efficiency, carbon emission, economy and other aspects [1]. As an important way of renewable energy utilization, China's ground source heat pump (especially buried pipe ground source heat pump) industry is developing rapidly [2]. Domestic scholars' researches on the performance of ground source heat pump system with buried pipes are mostly carried out based on short-term measured data and long-term simulated data [3,4], while foreign researches are mostly carried out based on long-term monitoring data. Based on the above contents, this paper analyzes and evaluates the long-term measured data of four domestic practical applications, so as to provide data reference for the implementation and operation of similar projects in China in the future
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